4. The network below shows the schedule of a simple project, The table shows the optimistic. modal, and pessimistic duration for each activity. (20 pts) a) Calculate the expected time, variance, and standard deviation for each activity. bj Find the critical path (based on expected times). ") Calculate the expected time, variance, and standard deviation of the project (for the critical pathi d) Find the day of completion with at least 99, 7% confidence. Activity |1 (10) m (im) butp) A B 19 7 LO D T S E 5 14 3 11 K 6 LO 12 M N 11 14